Direction dependence of the deceleration parameter
文献类型：期刊论文
| 作者 | Cai, RG ; Tuo, ZL |
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2012 |
| 期号 | 2 |
| 关键词 | QUASAR POLARIZATION VECTORS PROBE WMAP OBSERVATIONS LUMINOUS RED GALAXIES IA LIGHT CURVES LAMBDA-CDM HUBBLE DIAGRAM SUPERNOVA DATA COSMOLOGY CONSTRAINTS UNIVERSE |
| ISSN号 | 1475-7516 |
| 通讯作者 | Cai, RG: Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China. |
| 中文摘要 | In this paper we study the possibly existing anisotropy in the accelerating expansion Universe by use of the full sample of Union2 data. Using the hemisphere comparison method to search for a preferred direction, we take the deceleration parameter q(0) as the diagnostic to quantify the anisotropy level in the wCDM model. We find that the maximum accelerating expansion direction is (l,b) = (314(+20 degrees)(degrees-13 degrees),(degrees-33 degrees)(+11 degrees)), with the maximum anisotropy level of Delta q(0,max)/(q) over bar (0) = 0.79(+0.27)(-0.28),and that the anisotropy is more prominent when only low redshift data (z <= 0.2) are used. We also discuss this issue in the CPL parameterized model, showing a similar result. |
| 收录类别 | SCI |
| 资助信息 | National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/36096]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Cai, RG,Tuo, ZL. Direction dependence of the deceleration parameter[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(2). |
| APA | Cai, RG,&Tuo, ZL.(2012).Direction dependence of the deceleration parameter.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2). |
| MLA | Cai, RG,et al."Direction dependence of the deceleration parameter".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2012). |
入库方式： OAI收割
来源：物理研究所
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